CN114402559A

CN114402559A - Demodulation reference signal modification for multi-signaling multi-transmit receive point operation

Info

Publication number: CN114402559A
Application number: CN202080064463.8A
Authority: CN
Inventors: M·科什内维桑; J·孙; 张晓霞; 骆涛
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2019-09-19
Filing date: 2020-09-05
Publication date: 2022-04-26
Also published as: EP4032217A1; WO2021055180A1; US11533156B2; US20210091915A1; US20230155803A1

Abstract

The present disclosure provides systems, methods, and apparatus, including computer programs encoded on a computer storage medium, for demodulation reference signal (DMRS) and cell-specific reference signal (CRS) collision avoidance procedures for wireless communications. Conventional networks and devices may not be able to perform DMRS shifting in certain modes. For example, when considering two transmissions of multiple TRP patterns, the alignment of the DMRS symbols for one transmission may be changed if the DMRS symbols are shifted due to collision with the CRS pattern. If the DMRS symbols for these transmissions are not aligned, interference or decoding failure may occur. The present disclosure enables procedures for performing DMRS shifts in multiple TRP modes. For example, the DMRS symbols for the two transmissions may be shifted in response to determining the overlap of one transmission. Such shifts may enable alignment of DMRS positions of the two transmissions to enable decoding of the transmissions.

Description

Demodulation reference signal modification for multi-signaling multi-transmit receive point operation

Cross Reference to Related Applications

The present application claims the benefits of U.S. patent application No.17/013,514 entitled "DEMODULATION reference signal modification FOR MULTIPLE signaling MULTIPLE TRANSMISSION receive POINT OPERATION" filed on 9, 4, 2020 and U.S. provisional patent application No.62/902,836 entitled "DEMODULATION reference signal modification FOR MULTIPLE signaling MULTIPLE TRANSMISSION receive POINT OPERATION" filed on 9, 19, 2019 and "DEMODULATION reference signal modification FOR MULTIPLE signaling MULTIPLE TRANSMISSION Receive POINT (TRP) field (DMRS) modification" filed on 19, 9, 57, both of which are expressly incorporated herein by reference.

Technical Field

Aspects of the present disclosure relate generally to wireless communication systems, and more particularly to demodulation reference signal (DMRS) and cell-specific reference signal (CRS) collision avoidance procedures.

Description of the related Art

Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and so on. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, typically multiple-access networks, support communication for multiple users by sharing the available network resources. One example of such a network is the Universal Terrestrial Radio Access Network (UTRAN). UTRAN is a Radio Access Network (RAN) defined as part of the Universal Mobile Telecommunications System (UMTS), which is a third generation (3G) mobile telephony technology supported by the third generation partnership project (3 GPP). Examples of multiple-access network formats include Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, orthogonal FDMA (ofdma) networks, and single carrier FDMA (SC-FDMA) networks.

A wireless communication network may include several base stations or node bs capable of supporting communication for several User Equipments (UEs). A UE may communicate with a base station via a Downlink (DL) and an Uplink (UL). The DL (or forward link) refers to the communication link from the base stations to the UEs, and the UL (or reverse link) refers to the communication link from the UEs to the base stations. The base station may transmit data and control information to the UE on the downlink or may receive data and control information from the UE on the uplink. On the downlink, transmissions from a base station may encounter interference due to transmissions from neighbor base stations or from other wireless Radio Frequency (RF) transmitters. On the uplink, transmissions from a UE may encounter uplink transmissions from other UEs communicating with neighbor base stations or interference from other wireless RF transmitters. This interference may degrade the performance of both the downlink and uplink.

As the demand for mobile broadband access continues to increase, the likelihood of interference and congested networks continues to increase as more UEs access the long-range wireless communication network and more short-range wireless systems are being deployed in the community. Research and development continue to advance UMTS technology not only to meet the ever-increasing demand for mobile broadband access, but also to enhance and enhance the user experience with mobile communications.

SUMMARY

The systems, methods, and apparatus of the present disclosure each have several inventive aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.

One innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication. The method includes receiving, by a User Equipment (UE), a first message scheduling a first transmission; and receiving, by the UE, a second message scheduling a second transmission. The first transmission is associated with a first demodulation reference signal (DMRS), and the second transmission is associated with a second DMRS. The method further includes determining, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS, wherein in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of the first DMRS or the second DMRS, modifying, by the UE, the at least one DMRS symbol of the first DMRS or the at least one DMRS symbol of the second DMRS.

In some implementations, modifying the at least one DMRS symbol of the first DMRS or the at least one DMRS symbol of the second DMRS may include modifying the at least one DMRS symbol of the first DMRS and the at least one DMRS symbol of the second DMRS.

In some implementations, the method may include receiving, by a UE, a first transmission having a modified DMRS symbol. In some such implementations, the method may include receiving, by the UE, a second transmission having the modified DMRS symbol.

In some implementations, the first message corresponds to a first Transmission Reception Point (TRP) and the second message corresponds to a second TRP.

In some implementations, the UE is operating in a multi-Downlink Control Information (DCI) multi-Transmit Reception Point (TRP) mode.

In some implementations, the first TRP is associated with a first CRS pattern and the second TRP is associated with a second CRS pattern.

In some implementations, the first message corresponds to Downlink Control Information (DCI).

In some implementations, the first message is a periodic grant and corresponds to a Downlink Control Information (DCI) or Radio Resource Control (RRC) message configured to schedule a plurality of transmissions including the first transmission.

In some implementations, the first message is received on a Physical Downlink Control Channel (PDCCH).

In some implementations, the first transmission is received on a Physical Downlink Shared Channel (PDSCH).

In some implementations, modifying the at least one DMRS symbol of the first DMRS or the second DMRS may include adjusting a position of the at least one DMRS symbol of the first DMRS.

In some implementations, modifying the at least one DMRS symbol of the first DMRS or the second DMRS may include: incrementing a position value of each DMRS symbol of a first DMRS of a first transmission by 1; and incrementing a position value of each DMRS symbol of the second DMRS of the second transmission by 1.

In some implementations, the method may include determining whether the first transmission at least partially overlaps the second transmission.

In some implementations, determining whether the one or more CRS patterns overlap with the first DMRS or the second DMRS is performed in response to determining that a first resource of a first transmission at least partially overlaps with a second resource of a second transmission.

In some implementations, the first resources of the first transmission are orthogonal to the second resources of the second transmission in the time domain, the frequency domain, or both.

In some implementations, the first resources of the first transmission do not overlap with the second resources of the second transmission in the time domain, the frequency domain, or both.

In some implementations, the UE performs DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmit Receive Point (TRP) mode independently of CRS and TRP associations.

In some implementations, a UE performs DMRS shifting across multiple Transmission Receiving Points (TRPs), and the UE performs rate matching per TRP.

In some implementations, the first message corresponds to a first Transmission Reception Point (TRP) or a first group of control resource sets (CORESET), and the second message corresponds to a second TRP or a second CORESET group, and the first and second CORESET groups are indicated by higher level signaling.

In some implementations, the method may include: prior to receiving the first message, transmitting, by the UE, a capability message indicating that the UE is configured for DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) pattern.

In some implementations, the method may include: prior to receiving the first message, receiving, by the UE, a message indicating that the UE is to perform DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) mode.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus configured for wireless communication. The apparatus includes at least one processor, and a memory coupled to the at least one processor. The at least one processor is configured to: a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) is received by a User Equipment (UE). The at least one processor is further configured to: receiving, by the UE, a second message scheduling a second transmission, the second transmission associated with a second DMRS. The at least one processor is configured to: determining, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS. The at least one processor is further configured to: modifying, by the UE, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one of the one or more CRS patterns overlaps the at least one DMRS symbol of the first DMRS or the second DMRS.

In some implementations, the device is configured to perform a method as described in any of the implementations described above.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus configured for wireless communication. The apparatus includes means for receiving, by a User Equipment (UE), a first message scheduling a first transmission, the first transmission associated with a first demodulation reference signal (DMRS). The apparatus also includes means for receiving, by the UE, a second message scheduling a second transmission, the second transmission associated with a second DMRS. The apparatus includes means for determining, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS. The apparatus further includes means for modifying, by the UE, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one CRS pattern of the one or more CRS patterns overlaps the at least one DMRS symbol of the first DMRS or the second DMRS.

Another innovative aspect of the subject matter described in this disclosure can be embodied in a non-transitory computer-readable medium that stores instructions that, when executed by a processor, cause the processor to perform operations that include receiving, by a User Equipment (UE), a first message scheduling a first transmission, the first transmission being associated with a first demodulation reference signal (DMRS). The operations also include receiving, by the UE, a second message scheduling a second transmission, the second transmission associated with a second DMRS. The operations include determining, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS. The operations further include modifying, by the UE, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one CRS pattern of the one or more CRS patterns overlaps with the at least one DMRS symbol of the first DMRS or the second DMRS.

In some implementations, the processor is configured to perform a method as described in any of the implementations described above.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication. The method includes transmitting, by a network entity, a first message scheduling a first transmission, the first transmission associated with a first demodulation reference signal (DMRS). The method also includes transmitting, by the network entity, a second message scheduling a second transmission, the second transmission associated with a second DMRS. The method includes determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS. The method further includes modifying, by the network entity, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one CRS pattern of the one or more CRS patterns overlaps the at least one DMRS symbol of the first DMRS or the second DMRS.

In some implementations, the method may include transmitting, by the network entity, a first transmission with a modified DMRS symbol. In some such implementations, the method may include transmitting, by the network entity, a second transmission having the modified DMRS symbol.

In some implementations, a network entity is operating in a multi-Downlink Control Information (DCI) multi-Transmit Reception Point (TRP) mode.

In some implementations, the first resources of the first transmission partially overlap with the second resources of the second transmission in the time domain, the frequency domain, or both.

In some implementations, the first resources of the first transmission completely overlap with the second resources of the second transmission in the time domain, the frequency domain, or both.

In some implementations, a network entity performs DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) pattern independent of CRS and TRP associations.

In some implementations, a network entity performs DMRS shifting across multiple Transmission Receiving Points (TRPs), and the network entity performs rate matching per TRP.

In some implementations, the method may include: prior to transmitting the first message, receiving, by a network entity, a capability message indicating that the UE is configured for DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmit Receive Point (TRP) pattern.

In some implementations, the method may include: transmitting, by a network entity, a message indicating that a User Equipment (UE) is to perform DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) mode prior to transmitting the first message.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus configured for wireless communication. The apparatus includes at least one processor, and a memory coupled to the at least one processor. The at least one processor is configured to: transmitting, by a network entity, a first message scheduling a first transmission, the first transmission associated with a first demodulation reference signal (DMRS). The at least one processor is further configured to: transmitting, by the network entity, a second message scheduling a second transmission, the second transmission associated with a second DMRS. The at least one processor is configured to: determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS. The at least one processor is further configured to: modifying, by the network entity, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with the at least one DMRS symbol of the first DMRS or the second DMRS.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus configured for wireless communication. The apparatus includes means for transmitting, by a network entity, a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS). The apparatus also includes means for transmitting, by the network entity, a second message scheduling a second transmission, the second transmission associated with a second DMRS. The apparatus includes means for determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS. The apparatus further includes means for modifying, by the network entity, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one CRS pattern of the one or more CRS patterns overlaps the at least one DMRS symbol of the first DMRS or the second DMRS.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations comprising: transmitting, by a network entity, a first message scheduling a first transmission, the first transmission associated with a first demodulation reference signal (DMRS). The operations also include transmitting, by the network entity, a second message scheduling a second transmission, the second transmission associated with a second DMRS. The operations include determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS. The operations further include modifying, by the network entity, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one CRS pattern of the one or more CRS patterns overlaps with the at least one DMRS symbol of the first DMRS or the second DMRS.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication. The method includes transmitting, by a network entity, a first message scheduling a first transmission, the first transmission associated with a first demodulation reference signal (DMRS). The method also includes determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS. The method includes modifying, by the network entity, at least one DMRS symbol of a first DMRS in response to determining that at least one CRS pattern of the one or more CRS patterns overlaps the at least one DMRS symbol of the first DMRS. The method further includes transmitting, by the network entity, a first transmission with the modified DMRS symbol.

In some implementations, the method may include determining, by the network entity, whether the one or more CRS patterns overlap with a second DMRS associated with a second transmission by another network entity, wherein modifying at least one DMRS symbol of the first DMRS is further in response to determining whether the at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of a second DMRS.

In some implementations, the method may include modifying, by the network entity, at least one DMRS symbol of a second DMRS in response to determining that at least one CRS pattern of the one or more CRS patterns overlaps with the at least one DMRS symbol of the first DMRS or the at least one DMRS symbol of the second DMRS.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication. The method includes receiving, by a User Equipment (UE), a configuration message including at least one cell-specific reference signal (CRS) pattern list for a component carrier, wherein a list of the at least one list is associated with a control resource set (CORESET) group. The method also includes receiving, by the UE, a first message scheduling a first transmission, and receiving, by the UE, a second message scheduling a second transmission. The first transmission is associated with a first demodulation reference signal (DMRS) and is for the component carrier, and the second transmission is associated with a second DMRS and is for the component carrier. The method further includes modifying, by the UE, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS based on the list being configured for the component carrier.

In some implementations, the first transmission is associated with the CORESET group and the second transmission is associated with a second CORESET group.

In some implementations, determining that the at least one list is configured for DMRS shifts indicating that one or more CRS patterns overlap with the first DMRS or the second DMRS.

In some implementations, the method may include determining, by the UE, whether one or more CRS patterns of the at least one list overlap with the first DMRS or the second DMRS, and wherein modifying at least one of the first DMRS symbols or at least one of the second DMRS symbols is further in response to determining that at least one of the one or more CRS patterns overlaps with at least one of the first DMRS or the second DMRS symbols.

In some implementations, the at least one CRS pattern list is configured for the component carrier to enable DMRS shifting, rate matching, or both.

In some implementations, the method may include receiving, by a UE, a first transmission having a modified DMRS symbol.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus includes at least one processor, and a memory coupled to the at least one processor. The at least one processor is configured to: receiving a configuration message comprising at least one cell-specific reference signal (CRS) pattern list for component carriers, wherein a list of the at least one list is associated with a control resource set (CORESET) group. The processor is further configured to: the method includes receiving a first message scheduling a first transmission and receiving a second message scheduling a second transmission. The first transmission is associated with a first demodulation reference signal (DMRS) and is for the component carrier, and the second transmission is associated with a second DMRS and is for the component carrier. The processor is further configured to: modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS based on the list being configured for the component carrier.

In some implementations, the apparatus is operating in a multi-Downlink Control Information (DCI) multi-Transmit Reception Point (TRP) mode.

In some implementations, the second CORESET group is associated with a second CRS pattern list of the at least one CRS pattern list.

In some implementations, the first message is received on a Physical Downlink Control Channel (PDCCH) and the first transmission is received on a Physical Downlink Shared Channel (PDSCH).

In some implementations, the apparatus performs DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) mode independent of CRS and TRP associations.

In some implementations, the device performs DMRS shifting across multiple Transmission Receiving Points (TRPs), and the device performs rate matching per TRP.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication. The method includes transmitting, by a network entity, a configuration message including at least one cell-specific reference signal (CRS) pattern list for a component carrier, wherein a list of the at least one list is associated with a control resource set (CORESET) group. The method also includes transmitting, by the network entity, a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier. The method includes transmitting, by the network entity, a second message scheduling a second transmission associated with a second DMRS and for the component carrier. The method further includes modifying, by the network entity, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that the list is configured for the component carrier.

In some implementations, the method may include: transmitting, by the network entity, a first transmission with the modified DMRS symbol; transmitting, by the network entity, a second transmission with the modified DMRS symbol; or both

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus includes at least one processor, and a memory coupled to the at least one processor. The at least one processor is configured to: transmitting a configuration message comprising at least one cell-specific reference signal (CRS) pattern list for component carriers, wherein a list of the at least one list is associated with a control resource set (CORESET) group. The at least one processor is further configured to: a first message is transmitted scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier. The at least one processor is configured to: transmitting a second message scheduling a second transmission associated with a second DMRS and for the component carrier. The at least one processor is further configured to: modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that the list is configured for the component carrier.

In some implementations, the first resources of the first transmission at least partially overlap with the second resources of the second transmission in the time domain, the frequency domain, or both.

In some implementations, the first message corresponds to the CORESET group, the second message corresponds to a second CORESET group, and the CORESET groups are indicated by higher level signaling.

The details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. It should be noted that the relative dimensions of the following figures may not be drawn to scale.

Brief Description of Drawings

Fig. 1 is a block diagram illustrating details of an example wireless communication system.

Fig. 2 is a block diagram conceptually illustrating an example design of an example base station and User Equipment (UE).

Fig. 3 is a diagram illustrating an example of a wireless communication system operating in a multiple transmission/reception point (TRP) scheme.

Fig. 4 is a block diagram illustrating an example of a process flow for different multiple TRP schemes.

Fig. 5A-5D are diagrams illustrating different example multiple TRP schemes.

Fig. 6 is a block diagram illustrating an example of a wireless communication system implementing DMRS modification.

Fig. 7A-7C are block diagrams illustrating examples of DMRS modifications for a single PDSCH.

Fig. 8A-8C are block diagrams illustrating examples of DMRS modifications for multiple PDSCHs.

Fig. 9 is a block diagram illustrating example blocks performed by a UE.

Fig. 10 is a block diagram illustrating example blocks performed by a network entity.

Fig. 11 is a block diagram conceptually illustrating an example design of a UE.

Fig. 12 is a block diagram conceptually illustrating an example design of a network entity.

Like reference numbers and designations in the various drawings indicate like elements.

Detailed Description

The following description is directed to certain implementations to illustrate the innovative aspects of the present disclosure. However, one of ordinary skill in the art will readily recognize that the teachings herein may be applied in a number of different ways.

Wireless communication systems operated by different network entities may share a frequency spectrum. In some examples, two network entities may be configured to send transmissions to a plurality of User Equipments (UEs). Thus, to enable network entities to make more use of the shared spectrum, and to mitigate interfering communications between different network entities, certain resources may be shifted to avoid collisions and interference in an effort to achieve successful reception and decoding.

For example, when a network entity and a UE are operating in a single Transmission Reception Point (TRP) mode, there are some scenarios in which demodulation reference signals (DMRS) are shifted to avoid collisions with cell-specific reference signal (CRS) modes or with reserved resources of a control resource set (CORESET). In other words, the position of the DMRS symbol may be shifted due to collision with other resources.

However, conventional networks and devices cannot perform DMRS shifting when operating in multiple TRP modes. For example, when two transmissions at least partially overlap, the alignment of the transmissions may be changed if the DMRS position of one of the transmissions is shifted due to collision of the corresponding CRS patterns. If DMRS symbols for overlapping transmissions are not aligned, the DMRS symbols may interfere or the UE may be unable to receive and decode one or more of the transmissions due to poor channel estimation performance. On the other hand, if it is ensured that DMRS symbols for overlapping transmissions are aligned, and DMRS ports for overlapping transmissions are separate and belong to different Code Division Multiplexing (CDM) groups, actual DMRS Resource Elements (REs) become orthogonal in the frequency domain, which enhances channel estimation performance. As such, implementations described herein enable procedures for performing DMRS shifts in multiple TRP patterns. Such shifts may enable alignment of DMRS positions of the two transmissions to enable reception and decoding of the transmissions by the UE. For example, the DMRS symbols for the two transmissions may be shifted in response to determining an overlap of one of the transmissions. Thus, the two transmissions may be DMRS shifted and remain aligned with each other. Particular implementations of the subject matter described in this disclosure can be realized to achieve one or more of the following potential advantages. For example, by enabling DMRS shifting for multiple TRP patterns, the network may send overlapping transmissions to increase bandwidth and reduce latency. Additionally, the network may be capable of operating in multiple TRP modes to enable carrier aggregation or dual connectivity (such as by using multiple signaling multiple TRP modes).

The present disclosure relates generally to providing or participating in authorized shared access between two or more wireless communication systems (also referred to as wireless communication networks). In various implementations, the techniques and apparatus (devices) may be used for wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, orthogonal FDMA (ofdma) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, fifth generation (5G) or New Radio (NR) networks (sometimes referred to as "5G NR" networks/systems/devices), and other communication networks. As described herein, the terms "network" and "system" may be used interchangeably.

A CDMA network may implement radio technologies such as Universal Terrestrial Radio Access (UTRA), CDMA2000, and so on. UTRA includes wideband CDMA (W-CDMA) and Low Chip Rate (LCR). CDMA2000 covers IS-2000, IS-95 and IS-856 standards.

TDMA networks may implement radio technologies such as global system for mobile communications (GSM). The 3GPP defines a standard for the GSM EDGE (enhanced data rates for GSM evolution) Radio Access Network (RAN), also denoted GERAN. GERAN is the radio component of GSM/EDGE along with a network that interfaces base stations (e.g., the Ater and Abis interfaces) with a base station controller (a interface, etc.). The radio access network represents the component of the GSM network through which telephone calls and packet data are routed from the Public Switched Telephone Network (PSTN) and the internet to and from subscriber handsets (also known as user terminals or User Equipment (UE)). The network of the mobile telephone operator may comprise one or more GERAN, which may be coupled with the UTRAN in the case of a UMTS/GSM network. Additionally, the operator network may include one or more LTE networks, or one or more other networks. The various different network types may use different Radio Access Technologies (RATs) and Radio Access Networks (RANs).

OFDMA networks may implement radio technologies such as evolved UTRA (E-UTRA), IEEE 802.11, IEEE802.16, IEEE 802.20, flash-OFDM, etc. UTRA, E-UTRA and GSM are part of the Universal Mobile Telecommunications System (UMTS). In particular, Long Term Evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from an organization named "third generation partnership project" (3GPP), while cdma2000 is described in documents from an organization named "third generation partnership project 2" (3GPP 2). These various radio technologies and standards are known or under development. For example, the third generation partnership project (3GPP) is a collaboration between groups of telecommunications associations that is intended to define the globally applicable third generation (3G) mobile phone specification. The 3GPP Long Term Evolution (LTE) is a 3GPP project aimed at improving the Universal Mobile Telecommunications System (UMTS) mobile phone standard. The 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure may describe certain aspects with reference to LTE, 4G, 5G, or NR techniques; however, the description is not intended to be limited to a particular technique or application, and one or more aspects described with reference to one technique may be understood to apply to another technique. Indeed, one or more aspects of the present disclosure relate to shared access to wireless spectrum between networks using different radio access technologies or radio air interfaces.

The 5G network contemplates various deployments, various frequency spectrums, and various services and devices that may be implemented using a unified OFDM-based air interface. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-a are considered. The 5G NR will be able to scale to provide coverage for: (1) with ultra-high density (such as about 1M nodes/km)²) Ultra-low complexity (such as on the order of tens of bits/second), ultra-low energy (such as about 10+ year battery life)) And large-scale internet of things (IoT) with deep coverage that can reach challenging locations; (2) including mission critical control of users with strong security (to protect sensitive personal, financial, or confidential information), ultra-high reliability (such as about 99.9999% reliability), ultra-low latency (such as about 1 millisecond (ms)), and with a wide range of mobility or lack of mobility; and (3) having enhanced mobile broadband, which includes very high capacity (such as about 10 Tbps/km)²) Extreme data rates (such as multi Gbps rates, 100+ Mbps user experience rates), and deep awareness with advanced discovery and optimization.

The 5G NR devices, networks and systems may be implemented to use optimized OFDM-based waveform characteristics. These features may include: scalable parameter sets and Transmission Time Intervals (TTIs); a common, flexible framework to efficiently multiplex services and features using a dynamic low latency Time Division Duplex (TDD)/Frequency Division Duplex (FDD) design; and advanced wireless technologies such as massive Multiple Input Multiple Output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel coding, and device-centric mobility. Scalability of the parameter sets (and scaling of subcarrier spacing) in 5G NRs can efficiently address operating diverse services across diverse spectrum and diverse deployments. For example, in various outdoor and macro coverage deployments with less than 3GHz FDD/TDD implementations, subcarrier spacing may occur at 15kHz, e.g., over a bandwidth of 1, 5, 10, 20MHz, etc. For other various outdoor and small cell coverage deployments of TDD greater than 3GHz, subcarrier spacing may occur at 30kHz over an 80/100MHz bandwidth. For other various indoor wideband implementations, the subcarrier spacing may occur at 60kHz over a 160MHz bandwidth using TDD over an unlicensed portion of the 5GHz band. Finally, for various deployments transmitting mmWave components in TDD at 28GHz, subcarrier spacing may occur at 120kHz over a 500MHz bandwidth.

The scalable parameter set of 5G NRs facilitates a scalable TTI to meet various latency and quality of service (QoS) requirements. For example, shorter TTIs may be used for low latency and high reliability, while longer TTIs may be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmission to start on symbol boundaries. The 5G NR also contemplates a self-contained integrated subframe design with uplink/downlink scheduling information, data, and acknowledgements in the same subframe. Self-contained integrated subframes support communication in an unlicensed or contention-based shared spectrum, supporting adaptive uplink/downlink that can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current traffic needs.

For clarity, certain aspects of the devices and techniques may be described below with reference to an example 5G NR implementation or in a 5G-centric manner, and 5G terminology may be used in various portions of the following description as an illustrative example; however, the description is not intended to be limited to 5G applications.

Further, it should be understood that, in operation, a wireless communication network adapted according to the concepts herein may operate with any combination of licensed or unlicensed spectrum depending on load and availability. Accordingly, it will be apparent to one of ordinary skill in the art that the systems, apparatus, and methods described herein may be applied to other communication systems and applications other than the specific examples provided.

Fig. 1 is a block diagram illustrating details of an example wireless communication system. The wireless communication system may include a wireless network 100. For example, wireless network 100 may comprise a 5G wireless network. As will be appreciated by those skilled in the art, the components appearing in fig. 1 are likely to have relevant counterparts in other network arrangements (including, for example, cellular network arrangements and non-cellular network arrangements, such as device-to-device or peer-to-peer or ad hoc network arrangements, etc.).

The wireless network 100 illustrated in fig. 1 includes several base stations 105 and other network entities. A base station may be a station that communicates with UEs and may be referred to as an evolved node B (eNB), a next generation eNB (gnb), an access point, and so on. Each base station 105 may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to this particular geographic coverage area of a base station or a base station subsystem serving the coverage area, depending on the context in which the term is used. In implementations of wireless network 100 herein, base stations 105 may be associated with the same operator or different operators, such that wireless network 100 may include multiple operator wireless networks. Additionally, in implementations of the wireless network 100 herein, the base station 105 may provide wireless communication using one or more of the same frequencies as neighboring cells (such as one or more bands in a licensed spectrum, an unlicensed spectrum, or a combination thereof). In some examples, individual base stations 105 or UEs 115 may be operated by more than one network operating entity. In some other examples, each base station 105 and UE115 may be operated by a single network operating entity.

A base station may provide communication coverage for a macro cell or a small cell (such as a pico cell or a femto cell), or other types of cells. A macro cell generally covers a relatively large geographic area (such as thousands of meters in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. Small cells, such as picocells, typically cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. Small cells, such as femtocells, typically also cover relatively small geographic areas, such as homes, and may have restricted access for UEs associated with the femtocell, such as UEs in a Closed Subscriber Group (CSG), UEs of users in the home, and so forth, in addition to unrestricted access. The base station of a macro cell may be referred to as a macro base station. The base station of a small cell may be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In the example shown in fig. 1, base stations 105D and 105e are conventional macro base stations, while base stations 105a-105c are macro base stations that are enabled for one of 3-dimensional (3D), full-dimensional (FD), or massive MIMO. The base stations 105a-105c take advantage of their higher dimensional MIMO capabilities to increase coverage and capacity with 3D beamforming in both elevation and azimuth beamforming. Base station 105f is a small cell base station, which may be a home node or a portable access point. A base station may support one or more cells, such as two cells, three cells, four cells, and so on.

Wireless network 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, each base station may have different frame timing, and transmissions from different base stations may not be aligned in time. In some scenarios, the network may be implemented or configured to handle dynamic switching between synchronous or asynchronous operations.

UEs 115 are dispersed throughout wireless network 100, and each UE may be stationary or mobile. It should be appreciated that although mobile devices are commonly referred to as User Equipment (UE) in standards and specifications promulgated by the 3 rd generation partnership project (3GPP), such devices may additionally or alternatively be referred to by those skilled in the art as a Mobile Station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communications device, a remote device, a mobile subscriber station, an Access Terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology. Within this document, a "mobile" device or UE need not have mobility capabilities and may be stationary. Some non-limiting examples of mobile devices may include, for example, implementations of one or more of the UEs 115, including mobile stations, cellular telephones (handsets), smart phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, laptops, Personal Computers (PCs), notebooks, netbooks, smartbooks, tablets, and Personal Digital Assistants (PDAs). The mobile device may additionally be an "internet of things" (IoT) or "internet of everything" (IoE) device, such as an automobile or other transportation vehicle, satellite radio, Global Positioning System (GPS) device, logistics controller, drone, multi-axis aircraft, quadcopter, smart energy or security device, solar panel or solar array, city lighting, water or other infrastructure; industrial automation and enterprise equipment; consumer and wearable devices, such as glasses, wearable cameras, smart watches, health or fitness trackers, mammalian implantable devices, gesture tracking devices, medical devices, digital audio players (such as MP3 players), cameras, game consoles, and the like; and digital home or smart home devices such as home audio, video and multimedia devices, appliances, sensors, vending machines, smart lighting, home security systems, smart meters, and the like. In one aspect, the UE may be a device that includes a Universal Integrated Circuit Card (UICC). In another aspect, the UE may be a device that does not include a UICC. In some aspects, a UE that does not include a UICC may be referred to as an IoE device. The UEs 115a-115d of the implementation illustrated in fig. 1 are examples of mobile smartphone type devices that access the wireless network 100. The UE may be a machine specifically configured for connected communications including Machine Type Communications (MTC), enhanced MTC (emtc), narrowband IoT (NB-IoT), etc. The UEs 115e-115k illustrated in fig. 1 are examples of various machines configured for communication to access the 5G network 100.

A mobile device, such as UE115, may be capable of communicating with any type of base station (whether macro, pico, femto, relay, etc.). In fig. 1, the communication link (represented as a flash beam) indicates a wireless transmission between the UE and a serving base station (the serving base station is a base station designated to serve the UE on the downlink or uplink), or a desired transmission between the base stations, and a backhaul transmission between the base stations. Backhaul communication between base stations of wireless network 100 may occur using wired and/or wireless communication links.

In operation of the 5G network 100, the base stations 105a-105c serve the UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity. The macro base station 105d performs backhaul communications with the base stations 105a-105c and the small cell base station 105 f. The macro base station 105d also transmits multicast services subscribed to and received by the

UEs

115c and 115 d. Such multicast services may include mobile television or streaming video, or may include other services for providing community information (such as weather emergencies or alerts, such as amber alerts or gray alerts).

Wireless network 100 of various implementations supports mission critical communications with ultra-reliable and redundant links for mission critical devices, such as UE115 e, which is a drone. The redundant communication links with the UE115 e include those from the

macro base stations

105d and 105e, and the small cell base station 105 f. Other machine type devices, such as UE115 f (thermometer), UE115 g (smart meter), and UE115 h (wearable device), may communicate with base stations, such as small cell base station 105f and macro base station 105e, directly through wireless network 100, or communicate through wireless network 100 in a multi-hop configuration by communicating with another user equipment that relays its information to the network (such as UE115 f communicating temperature measurement information to smart meter UE115 g, which is reported to the network through small cell base station 105 f). The 5G network 100 may provide additional network efficiency through dynamic low latency TDD/FDD communications (such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i-115k in communication with the macro base station 105 e).

Fig. 2 is a block diagram conceptually illustrating an example design of a base station 105 and a UE 115. The base station 105 and the UE115 may be one of the base stations and one of the UEs in fig. 1. For a restricted association scenario (as mentioned above), the base station 105 may be the small cell base station 105f in fig. 1, and the UE115 may be a UE115 c or 115d operating in the service area of the base station 105f, which UE115 is to be included in an accessible UE list of the small cell base station 105f in order to access the small cell base station 105 f. Additionally, the base station 105 may be some other type of base station. As shown in fig. 2, the base station 105 may be equipped with antennas 234 a-234 t and the UE115 may be equipped with antennas 252 a-252 r for facilitating wireless communications.

At the base station 105, a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240. The control information may be used for a Physical Broadcast Channel (PBCH), a Physical Control Format Indicator Channel (PCFICH), a physical hybrid ARQ (automatic repeat request) indicator channel (PHICH), a Physical Downlink Control Channel (PDCCH), an enhanced physical downlink control channel (ePDCCH), an MTC Physical Downlink Control Channel (MPDCCH), and the like. The data may be for PDSCH, etc. Transmit processor 220 may process (such as encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Additionally, transmit processor 220 may generate reference symbols, such as reference symbols for a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), as well as cell-specific reference signals. A Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing on the data symbols, the control symbols, or the reference symbols, if applicable, and may provide output symbol streams to Modulators (MODs) 232a through 232 t. For example, the spatial processing performed on the data symbols, control symbols, or reference symbols can include precoding. Each modulator 232 may process a respective output symbol stream (such as for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may additionally or alternatively process the output sample stream to obtain a downlink signal. For example, to process the output sample stream, each modulator 232 may convert to analog, amplify, filter, and upconvert the output sample stream to obtain a downlink signal. Downlink signals from modulators 232a through 232t may be transmitted via antennas 234a through 234t, respectively.

At UE115, antennas 252a through 252r may receive downlink signals from base station 105 and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may process a respective received signal to obtain input samples. For example, to condition the respective received signal, each demodulator 254 may filter, amplify, downconvert, and digitize the respective received signal to obtain input samples. Each demodulator 254 may further process the input samples (such as for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process the detected symbols, provide decoded data for UE115 to a data sink 260, and provide decoded control information to a controller/processor 280. For example, to process the detected symbols, receive processor 258 may demodulate, deinterleave, and decode the detected symbols.

On the uplink, at UE115, a transmit processor 264 may receive and process data from a data source 262, such as data for a Physical Uplink Shared Channel (PUSCH), and control information from a controller/processor 280, such as control information for a Physical Uplink Control Channel (PUCCH). Additionally, transmit processor 264 may generate reference symbols for a reference signal. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (such as for SC-FDM, etc.), and transmitted to base station 105. At the base station 105, the uplink signals from the UE115 may be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 115. Receive processor 238 may provide decoded data to a data sink 239 and decoded control information to controller/processor 240.

Controllers/

processors

240 and 280 may direct the operation at base station 105 and UE115, respectively. A controller/processor 240 or other processor and module at base station 105, or a controller/processor 280 or other processor and module at UE115 may perform or direct performance of various processes for the techniques described herein, such as to perform or direct performance illustrated in fig. 9 and 10, or other processes for the techniques described herein.

Memories

242 and 282 may store data and program codes for base station 105 and UE115, respectively. A scheduler 244 may schedule UEs for data transmission on the downlink or uplink.

In some cases, the UE115 and the base station 105 may operate in a shared radio frequency spectrum band, which may include a licensed or unlicensed (such as contention-based) spectrum. In an unlicensed frequency portion of the shared radio frequency spectrum band, a UE115 or base station 105 may conventionally perform a medium sensing procedure to contend for access to the spectrum. For example, the UE115 or base station 105 may perform a listen before talk or Listen Before Transmit (LBT) procedure, such as Clear Channel Assessment (CCA), prior to communication in order to determine whether a shared channel is available. The CCA may include an energy detection procedure to determine whether there are any other active transmissions. For example, the device may infer that a change in the Received Signal Strength Indicator (RSSI) of the power meter indicates that the channel is occupied. In particular, a signal power concentrated in a particular bandwidth and exceeding a predetermined noise floor may be indicative of another wireless transmitter. In some implementations, the CCA may include detection of a particular sequence indicating channel usage. For example, another device may transmit a particular preamble before transmitting a data sequence. In some cases, an LBT procedure may include a wireless node as a proxy for collisions to adjust its own backoff window based on the amount of energy detected on the channel or acknowledgement/negative acknowledgement (ACK/NACK) feedback for its own transmitted packets.

Using a medium sensing procedure to contend for access to an unlicensed shared spectrum may result in communication inefficiencies. This may be particularly apparent when multiple network operating entities (such as network operators) are attempting to access the shared resources. In the 5G network 100, the base station 105 and the UE115 may be operated by the same or different network operating entities. In some examples, individual base stations 105 or UEs 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE115 may be operated by a single network operating entity. Requiring each base station 105 and UE115 of different network operating entities to contend for shared resources may result in increased signaling overhead and communication latency.

Fig. 3 illustrates an example of a wireless communication system 300 that supports different multiple TRP schemes. In some examples, the wireless communication system 300 may implement aspects of the wireless communication system 100. For example, the wireless communication system 300 may include a plurality of UEs 115 and base stations 105. The base station 105 may use the TRP305 to communicate with the UE 115. Each base station 105 may have one or more TRPs 305. For example, base station 105-a may include TRP305-a and TRP 305-b, while base station 105-b may include TRP 305-c. The UE 115-a may communicate with the network using: a single TRP305, multiple TRPs 305 corresponding to a single base station 105 (such as TRPs 305-a and 305-b at base station 105-a), or multiple TRPs 305 corresponding to multiple different base stations 105 (such as TRP305-a at base station 105-a and TRP 305-c at base station 105-b, where base stations 105-a and 105-b may be connected via a backhaul connection).

In a communication scheme including multiple TRPs 305, a single DCI message may configure a pinCommunication to a plurality of TRPs 305. In an example, a base station 105-a may communicate using a first TRP305-a and a second TRP 305-b. The base station 105-a may use the TRP305-a to transmit the DCI on the PDCCH 310-a to the UE 115-a. The DCI may include communication configuration information regarding the TCI state(s). The TCI state(s) can determine whether a communication corresponds to a single TRP communication or multiple TRP communications. The TCI status(s) may also indicate a communication scheme type (such as TDM, FDM, SDM, etc.) configured for communication. If the TCI configuration is one TCI state, the one TCI state may correspond to a single TRP communication. If the TCI configuration is multiple TCI states, the multiple TCI states may correspond to communications with multiple TRPs. In some cases, the wireless communication system 300 may support up to M candidate TCI states for purposes of quasi-co-location (QCL) indication. Among the M candidates, such as 128 candidate TCI states, a subset of TCI states may be determined based on a Media Access Control (MAC) Control Element (CE). The MAC-CE may correspond to a particular number of QCL indications (such as 2) for PDSCH^NOne (such as 8 TCI states)) candidate TCI states. These 2 bits may be dynamically indicated using N bits in a message (such as DCI)^NOne of the TCI states.

DCI on PDCCH 310-a may schedule PDSCH 315-a transmission from TRP305-a for a single TRP communication configuration. Alternatively, DCI on PDCCH 310-a may schedule multiple PDSCH 315 transmissions from multiple TRPs 305. For example, the DCI may schedule PDSCH 315-a transmission from TRP305-a and PDSCH 315-b transmission from TRP 305-b, or PDSCH 315-a transmission from TRP305-a and PDSCH 315-c transmission from TRP 305-c for a multiple TRP communication configuration. The UE115 may be configured with a list of different candidate TCI states for purposes of QCL indication. Each TCI codepoint in the DCI may correspond to one or more TCI states, such as to one or more sets of Reference Signals (RSs) that indicate QCL relationships.

In a scenario where the network utilizes TRP305 to communicate with UE115, whether in a single TRP configuration or in a multiple TRP configuration, there may be a number of different schemes to communicate with TRP(s) 305. The TRP communication scheme may be determined by the TCI status. The TCI status(s) for communication on PDSCH 315 may be indicated in DCI by one or more bits, where the one or more bits indicate the TCI codepoint. A TCI codepoint in the DCI may correspond to one or more TCI states (such as one TCI state or two TCI states). The UE115 is configured for single TRP operation if a TCI codepoint in the DCI indicates one TCI status. If a TCI codepoint in the DCI indicates two TCI states (and, correspondingly, two QCL relationships), the UE115 is configured for multiple TRP operation. For example, if two TCI states are indicated within a TCI code point, each TCI state may correspond to one DMRS Code Division Multiplexing (CDM) group.

In a first example multi-TRP scheme, the TRP305 may communicate by utilizing an SDM. In this case, different spatial layers may be transmitted from different TRPs 305 on the same RB and symbol. Each TCI state may also correspond to a different DMRS port group. The DMRS ports in the DMRS CDM port group may be quasi-co-located (QCL). This may allow UE115 to estimate each channel separately. In SDM, each antenna port used on the downlink may belong to a different CDM group. The base station 105-a may indicate the antenna port group using an antenna port field in the DCI.

SDM schemes may include different TCI states within a single time slot, where the TCI states overlap in time, frequency, or both. Different spatial layer groups (which may correspond to different TCI states) may use the same modulation order. The case where a plurality of groups use the same modulation order may be signaled by a Modulation and Coding Scheme (MCS). In some cases, base station 105-a may indicate the MCS in the DCI. In the case where different spatial layer groups use different modulation orders, each of these different modulation orders may be signaled to the UE 115-a. Different DMRS port groups may correspond to different TRPs, QCL relationships, TCI states, or combinations thereof.

In other examples of a multiple TRP scheme, TRP305 may communicate with UE 115-a by utilizing an FDM or TDM communication scheme. In the FDM scheme, one RB set or PRG set may correspond to a first TRP305-a and a first TCI state, and a second RB set or PRG set may correspond to a second TRP 305-b and a second TCI state. The RBs allocated for each TRP may be different from each other such that each TRP communicates on a designated set of RBs that is different from another set of RBs (but may overlap in the same OFDM symbol). A frequency domain resource assignment field in the DCI may indicate both the first RB or PRG set and the second RB or PRG set. In some cases, base station 105-a may use additional signaling in the DCI to indicate which RBs belong to the first set and which RBs belong to the second set. In some cases, the system may support a limited number of possibilities for allocating frequency resources to different TRPs (such as to reduce overhead).

In TDM schemes, similar likelihood tables may be used to signal resource allocations for different TRPs. In this case, each TRP is allocated to a different set of OFDM symbols, not to a different set of RBs. Such TDM schemes may support TDM transmissions within a single time slot, such as a Transmission Time Interval (TTI). In some cases, TDM schemes may enable slot aggregation, where transmissions using different TCI states may be spread across different slots (such as TTIs). In slot aggregation, transmissions on different TRPs may use separate rate matching, but may have the same or different modulation orders.

The network may communicate with UE 115-a using multiple TRPs and any communication schemes described herein. Further, some communication schemes may include a combination of TDM and FDM, or a scenario in which TDM may or may not be in a slot aggregation configuration. These schemes may also include some cases where rate matching is joint and some cases where rate matching is separate for different TRPs, and may also include cases where different TRPs have the same or different modulation orders. Each scheme may also utilize different parameters included in the signaling, such as which DMRS ports to use (such as for SDM schemes) or how RBs are split (such as for FDM schemes).

To efficiently configure UE 115-a with TCI status information-and the corresponding TRP scheme-base station 105-a may generate bits for a DCI message and may transmit the DCI on PDCCH 310-a. The DCI message may be transmitted to UE 115-a using TRP 305-a. The UE 115-a may determine which scheme is configured for communication with the TRP305 based on one or more fields of the received DCI. The DCI may be the same size across all communication schemes, and the formatting (such as the number of bits) of the DCI field may remain the same across these communication schemes.

Fig. 4 is a block diagram illustrating an example of a process flow for different multiple TRP schemes. Fig. 4 illustrates an example of a process flow 400 supporting different multiple TRP schemes. In some examples, process flow 400 may implement aspects of

wireless communication system

100 or 300. For example, base station 105 and UE115 (such as base station 105-c and UE 115-b) may perform one or more of the processes described with reference to process flow 400. The base station 105-c may communicate with the UE115-b by transmitting and receiving signals via the TRPs 405-a and 405-b. In other cases, TRPs 405-a and 405-b may correspond to different base stations 105. Alternative examples may be implemented in which some steps are performed in a different order than described or not performed at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

At 410, the base station 105-c may generate DCI. The generating may include generating a first set of bits (such as a TCI field) that may indicate a set of TCI states for communicating with the UE 115-b. The generating may also include generating a second set of bits (such as an antenna port field) that may indicate the set of antenna ports and, in some cases, the multi-TRP communication scheme to be used for the multi-TRP communication operation. In some cases, the second set of bits may additionally indicate a modulation order for at least one TCI state (such as the second TCI state for the TRP 405-b), an RV for a TB for at least one TCI state (such as the second TCI state for the TRP 405-b), or a combination thereof.

At 415, the base station 105-c may transmit the generated DCI to the UE 115-b. The UE115-b may receive DCI from the base station 105-c. The DCI may be transmitted from the TRP 405-a on the PDCCH. The DCI may schedule the upcoming PDSCH transmission and may include other control information. The DCI may include an indication of the first set of bits and the second set of bits. For example, the DCI may include encoded bits based on a first set of bits and a second set of bits.

At 420, UE115-b may read a TCI field (such as a first set of bits) received in the DCI message. UE115-b may use the first set of bits to identify one or more TCI states for communicating with base station 105-c using one or more TRPs 405.

At 425, UE115-b may determine a TCI status configuration based on reading the TCI field of the DCI. For example, the value in the TCI field (such as TCI-PresentInDCI) may not be configured as CORESET for scheduling PDSCH, or that is, the value may correspond to one TCI state. In these cases, the communication scheme may be configured for one TRP. In other cases, the TCI field value may correspond to more than one TCI state. In these other cases, the communication may be configured for communication with multiple TRPs.

UE115-b may read the antenna port field of the DCI and may interpret the value of this field based on the determined TCI status configuration. For example, if the UE115-b determines that the TCI field indicates a single TCI status, the UE115-b may use the second set of bits to identify a set of antenna ports for PDSCH transmission. At 430, the UE115-b may access a table (such as preconfigured in memory or configured by the network) to determine one or more antenna ports corresponding to the antenna port field value.

Alternatively, if the UE115-b determines that the TCI field indicates multiple TCI states, the UE115-b may identify the set of antenna ports and the multiple TRP communication scheme based on identifying the set of TCI states using the second set of bits. The second set of bits may include the same number of bits regardless of whether the field indicates only a set of antenna ports for single TRP operation or indicates a set of antenna ports for multi TRP operation and a multi TRP scheme. At 430, the UE115-b may access a lookup table to determine an antenna port set and a multi-TRP scheme based on the antenna port field value. In some cases, UE115-b may select a lookup table from a set of lookup tables, where the set may include one lookup table to be used for TRP operations and one lookup table to be used for multi-TRP operations.

The look-up table may comprise information mapping both the set of antenna ports and the multi-TRP scheme to the second set of bits. In some cases, a look-up table mapping both the set of antenna ports and the multi-TRP communication scheme to the second set of bits may be pre-configured in memory, and in some cases it may be dynamically configured by the base station 105-c. The UE115-b may identify the second set of antenna ports and the multiple TRP scheme based on the selected lookup table. In a lookup table for multi-TRP operation, the table may include an indication of a multi-TRP scheme (such as SDM, FDM, TDM, or some combination thereof) along with an indication of DMRS ports. The antenna port field lookup table may indicate that values in the antenna port field of the DCI correspond to a set of DMRS ports, where the set of DMRS ports further correspond to a communication scheme, such as SDM or FDM. The antenna port field value may also indicate whether rate matching is joint or individual. If the antenna port field value indicates that the FDM communication scheme is used, the table may additionally indicate an RB configuration for the FDM TCI state, as shown in the "possibility" column of the following table. If the look-up table is configurable by the network, the network may use Radio Resource Control (RRC) signaling to define the possible sets of DMRS ports and scheme types.

In some cases, the UE115-b may use the second set of bits to identify a modulation order for at least one TCI state of the set of possible TCI states. Different modulation orders may also be used across different TCI states. A first modulation order may be indicated in the modulation order field. In multi-TRP operation, the first modulation order may correspond to a first TCI state. The second modulation order may be indicated in one of the above tables based on the received antenna port field value. For example, a column in the antenna port field lookup table may indicate whether the modulation order corresponding to the second TCI state is the same as the modulation order indicated in the MCS (i.e., the modulation order for the first TCI state). If the modulation order is not the same as the modulation order indicated in the MCS, a value of the modulation order for the second TCI state may be indicated in the antenna port field. The value of the modulation order may be an absolute value or may be a relative value with respect to the first modulation order.

If the TCI status configuration is determined to indicate communication with a single TRP, the UE115-b may receive a transmission from one TRP 405-a at 435. The UE115-b may communicate with the single TRP 405-a based on the determined communication scheme.

If the TCI status configuration is determined to indicate communication with multiple TRPs 405, UE115-b may receive a transmission from one TRP 405-a at 435 and may also receive a transmission from another TRP 405-b at 440 (where 435 and 440 may correspond to the same time or OFDM symbol in some cases). The UE115-b may communicate with the network via the plurality of configured TRPs 405 based on the determined communication scheme.

Systems and methods described herein relate to DMRS modifications for multiple messaging and multiple TRP modes. These DMRS modifications may enable enhanced or improved operation in multiple TRP modes. In some implementations, the systems and methods described herein enable DMRS shifting in multiple DCI-based multiple TRP modes. Accordingly, such systems and methods may be used for multiple TRP modes.

Fig. 5A-5D are diagrams illustrating different example multiple TRP schemes. Referring to fig. 5A-5D, examples of diagrams for different example TRP patterns are illustrated. In fig. 5A, a diagram illustrating carrier aggregation is illustrated. Fig. 5A depicts one base station 105A communicating with a UE 115A. Base station 105a may transmit data and control information; the base station 105 may transmit (and receive) information using different devices or settings, such as different frequencies. In fig. 5B, a diagram illustrating dual connectivity is illustrated. Fig. 5B depicts two base stations 105a and 105B communicating with the UE115 a. The UE115 a communicates data with both base stations and control information with one base station, the primary base station 105 a.

Fig. 5C and 5D describe DCI-based operation for multiple TRP modes. Fig. 5C depicts a single DCI mode of operation, and fig. 5D depicts a multiple DCI mode of operation. In fig. 5C and 5D, the system includes a first TRP 505a, a second TRP 505b, and a UE 515. The second TRP 505B may be included with the first TRP 505A (such as the two TRPs of the first base station 105A of fig. 5A) or may be separate from the first TRP 505A (such as the TRP of fig. 5B from each of the first and second base stations 105A and 105B). In fig. 5C, a first TRP 505a transmits downlink control information or DCI, as illustrated by a first PDCCH 512. In fig. 5C, the first PDCCH 512 schedules two PDSCHs — a first PDSCH 522 and a second PDSCH 524.

In contrast, in fig. 5D, both the first TRP 505a and the second TRP 505b transmit DCI as illustrated by

PDCCHs

512 and 514. Each

PDCCH

512 and 514 schedules a corresponding PDSCH-

PDSCH

522, 524. These PDSCH resources may overlap, partially overlap, or not overlap. For PDCCH 512 and 515, different CORESET or CORESET groups may be used for the two TRPs 505a and 505b (i.e., a first CORESET group for a first transmission for a first TRP 505a and a second CORESET group for a second transmission for a second TRP 505 b). Each CORESET or group of CORESETs may have a different TCI state.

The CORESET group may or may not be indicated to the UE. For example, the CORESET group may be indicated by higher layer signaling when signaled to the UE. The CORESET group information may be used for DMRS modification, CRS rate matching, or both. As another example, when not signaled, the UE may not be aware of the CORESET group and may not utilize the CORESET group data for DMRS modification, CRS rate matching, or both.

Fig. 6 is a block diagram illustrating an example of a wireless communication system implementing DMRS modification. Fig. 6 illustrates an example of a wireless communication system 600 that supports DMRS modification. In some examples, the wireless communication system 600 may implement aspects of the wireless communication system 100. For example, the wireless communication system 600 may include a network entity 605 (such as a base station 105), the UE115, and optionally a second network entity 607 (such as a second base station 105, or a second TRP of the base station 105). DMRS modification operations may enable multi-TRP operations based on multiple DCI as well as operations with other types of networks, such as LTE. Operating over multiple networks and bandwidths may enable increased throughput and reliability as well as reduced latency.

The network entity 605 and the UE115 may be configured to communicate via a frequency band, such as FR1 for millimeter waves (which has a frequency of 410 to 7125 MHz) or FR2 (which has a frequency of 24250 to 52600 MHz). It should be noted that for some data channels, the subcarrier spacing (SCS) may be equal to 15, 30, 60, or 120 kHz. The network entity 605 and the UE115 may be configured to communicate via one or more Component Carriers (CCs), such as representative first and

second CCs

681, 682, 683, and 684. Although four CCs are shown, this is for illustration only, as more or less than four CCs may be used. One or more CCs may be used to communicate a Physical Downlink Control Channel (PDCCH), a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Control Channel (PUCCH), or a Physical Uplink Shared Channel (PUSCH). In some implementations, such transmissions may be scheduled by dynamic grants. In some other implementations, such transmissions may be scheduled by one or more periodic grants and may correspond to a semi-persistent scheduling (SPS) grant or a configured grant of the one or more periodic grants.

Each periodic grant may have a corresponding configuration, such as configuration parameters/settings. The periodic grant configuration may include SPS configuration and settings. Additionally or alternatively, one or more periodic grants (such as SPS grants thereof) may have or be assigned to a CC ID, such as an expected CC ID.

Each CC may have a corresponding configuration, such as configuration parameters/settings. The configuration may include bandwidth, a bandwidth portion, a hybrid automatic repeat request (HARQ) process, a TCI state, RSs, control channel resources, data channel resources, or a combination thereof. Additionally or alternatively, one or more CCs may have or be assigned a cell ID, a bandwidth part (BWP) ID, or both. The cell ID may include a unique cell ID of the CC, a virtual cell ID, or a specific cell ID of a specific CC of the plurality of CCs. Additionally or alternatively, one or more CCs may have or be assigned to a HARQ ID. Each CC may also have corresponding management functionality, such as beam management, BWP switching functionality, or both. In some implementations, two or more CCs are quasi-co-located such that the CCs have the same beam or the same symbol.

In some implementations, the control information may be communicated via the network entity 605 and the UE 115. For example, the control information may be communicated using a MAC-CE transmission, an RRC transmission, a DCI transmission, another transmission, or a combination thereof.

UE115 includes a processor 602, memory 604, a transmitter 610, a receiver 612, an encoder 613, a decoder 614, a DMRS modifier 615, a CRS rate matcher 616, and antennas 252 a-r. The processor 602 may be configured to execute instructions stored in the memory 604 to perform the operations described herein. In some implementations, the processor 602 includes or corresponds to the controller/processor 280 and the memory 604 includes or corresponds to the memory 282. Memory 604 may also be configured to store DMRS data 606, CRS data 608, CORESET group data 642, modification parameter data 644, or a combination thereof, as further described herein.

DMRS data 606 corresponds to or is associated with DMRS data of: a network entity 605, a second network entity 607, or both. To illustrate, DMRS data 606 may include DMRS symbols for transmissions (such as PDSCH transmissions), and the locations of these DMRS symbols in the transmissions. CRS data 608 includes or corresponds to or is associated with CRS data of: a network entity 605, a second network entity 607, or both. To illustrate, the CRS data 608 may include timing and location data (commonly referred to as CRS pattern) for CRS data. The CRS data 608 may include or indicate one or more CRS patterns and may include or correspond to CRS pattern parameters (such as lte-CRS-tomacharound). Some CRS pattern parameters may include or be associated with multiple CRS patterns (whereby such CRS pattern parameters are known and referred to in the art as a CRS pattern list). Such CRS pattern parameters (including lists) are referred to in the art as being associated with a particular component carrier because they are configured per component carrier.

The CORESET group data 642 includes or corresponds to data that associates or links (and optionally transmits) a network entity, such as a base station, cell, or TRP thereof, to a particular DMRS, a particular CRS pattern, or both. The CORESET group data 642 may be indicated by higher layer signaling, such as RRC signaling (such as a configuration message). Alternatively, only the network entity includes such association data, and the UE is unaware of such association. In such implementations, the UE may perform DMRS modification (such as shifting), CRS rate matching, or both, independently of the network entity association.

The modification parameter data 644 includes or corresponds to data used by the UE115 to modify the DMRS data 606, such as being configured to modify the DMRS data 606 to generate modified DMRS data (such as 696, 698). The DMRS data 606 may further include modified DMRS data (696, 698) of or associated with: a network entity 605, a second network entity 607, or both. To illustrate, the DMRS data 606 may include modified locations of DMRS symbols in a transmission.

The transmitter 610 is configured to transmit data to one or more other devices, and the receiver 612 is configured to receive data from one or more other devices. For example, the transmitter 610 may transmit data and the receiver 612 may receive data via a network (such as a wired network, a wireless network, or a combination thereof). For example, the UE115 may be configured to transmit or receive data via a direct device-to-device connection, a Local Area Network (LAN), a Wide Area Network (WAN), a modem-to-modem connection, the internet, an intranet, an extranet, a cable transmission system, a cellular communication network, any combination of the above, or any other communication network now known or later developed that permits two or more electronic devices to communicate. In some implementations, the transmitter 610 and receiver 612 may be replaced with transceivers. Additionally or alternatively, the transmitter 610, the receiver 612, or both, may include or correspond to one or more components of the UE115 described with reference to fig. 2.

The encoder 613 and decoder 614 may be configured to encode and decode, such as encoding or decoding, transmissions with modified DMRS locations, respectively. DMRS modifier 615 may be configured to perform DMRS modification. For example, DMRS modifier 615 is configured to modify the position of one or more DMRS symbols used to encode or decode a transmission. To illustrate, in response to determining collision or overlap with CRS resources, partial or full overlap with the second transmission, or both, DMRS modifier 615 adjusts the position of the overlapping DMRS symbols. In some implementations, the DMRS modifier 615 adjusts (such as increments or decrements) the position of each DMRS symbol for each transmission (i.e., the DMRS symbols for the first and second transmissions).

The CRS rate matcher 616 may be configured to perform CRS rate matching of transmissions, such as a first PDSCH transmitted from a first TRP associated with a higher indexed first value or a first PDSCH transmitted from a first TRP associated with a higher indexed first value, around a particular LTE CRS or LTE CRS pattern. Such rate matching procedures enable coexistence of NR and LTE, as the NR's data transmission (such as the first PDSCH or the second PDSCH) is rate matched around one or more LTE CRS patterns.

The network entity 605 includes a processor 630, a memory 632, a transmitter 634, a receiver 636, an encoder 637, a decoder 638, a DMRS modifier 639, a CRS rate matcher 640, and antennas 234 a-t. The processor 630 may be configured to execute instructions stored in the memory 632 to perform the operations described herein. In some implementations, the processor 630 includes or corresponds to the controller/processor 240 and the memory 632 includes or corresponds to the memory 242. Memory 632 may be configured to store DMRS data 606, CRS data 608, CORESET group data 642, modification parameters 644, or a combination thereof, similar to UE115 and as further described herein.

The transmitter 634 is configured to transmit data to one or more other devices, and the receiver 636 is configured to receive data from one or more other devices. For example, the transmitter 634 may transmit data, and the receiver 636 may receive data via a network (such as a wired network, a wireless network, or a combination thereof). For example, network entity 605 may be configured to transmit or receive data via a direct device-to-device connection, a Local Area Network (LAN), a Wide Area Network (WAN), a modem-to-modem connection, the internet, an intranet, an extranet, a cable transmission system, a cellular communication network, any combination of the above, or any other communication network now known or later developed that permits two or more electronic devices to communicate. In some implementations, the transmitter 634 and receiver 636 may be replaced with transceivers. Additionally or alternatively, the transmitter 634, the receiver 636, or both may include or correspond to one or more components of the network entity 605 described with reference to fig. 2. The encoder 637 and decoder 638 may include the same functionality as described with reference to the encoder 613 and decoder 614, respectively. The DMRS modifier 639 and the CRS rate matcher 640 may include the same functionality as described with reference to the DMRS modifier 615 and the CRS rate matcher 616, respectively.

During operation of the wireless communication system 600, the network entity 605 may determine that the UE115 has DMRS shifting capability for multiple TRP operating modes (such as a multi-DCI multiple TRP operating mode). For example, the UE115 may transmit a message 648 (such as a capability message) that includes a DMRS shift indicator 672. The indicator 672 may indicate an enhanced DMRS shifting capability or a specific type of DMRS shifting, such as by incrementing a position value. In some implementations, the network entity 605 sends control information to indicate to the UE115 that DMRS shifting capabilities for multiple TRP operating modes are to be used. For example, in some implementations, the message 648 (or another message, such as a response or trigger message) is transmitted by the network entity 605.

In the example of fig. 6, the network entity 605 transmits an optional configuration transmission 649. The configuration transmission 649 may include or indicate a DMRS modification configuration, such as modification parameter data 644. The configuration transmission 649 (such as its 644) may indicate how to adjust the position of DMRS symbols or in what type of DMRS shift pattern to operate (such as per TRP, across all TRPs, independent CRS rate matching, etc.).

After transmission of message 648 (such as a DMRS shift configuration message, such as an RRC message or DCI), the transmission may be scheduled by network entity 605, network entity 607, UE115, or both. Such scheduled transmissions may include shared channel transmissions, such as PDSCH or PUSCH. Such transmissions may be scheduled by dynamic grants or by periodic grants. The periodic grants are configured to schedule one or more SPS grants (such as PDSCH).

In the example of fig. 6, the network entity 605 transmits a first message 650, and optionally a second message 660. For example, the network entity 605 is a base station comprising a plurality of TRPs, and different TRPs convey

messages

650, 660. In some other implementations, the second network entity 607 transmits the second message 660. For example, in such implementations, each of the network entities 605, 607 may include or correspond to a TRP of a different panel or a TRP of a different base station.

The first and

second messages

650, 660 may include or correspond to DCI or RRC messages and may be transmitted via corresponding PDCCHs. The first message 650 and the second message 660 each schedule one or more corresponding downlink transmissions. In the example of fig. 6, first message 650 schedules first transmission 652 and second message 660 schedules second transmission 662.

Each of the first message 650 and the second message 660 has or is associated with a corresponding DMRS for one or more corresponding downlink transmissions. In fig. 6, these corresponding DMRSs include a first DMRS692 of or associated with a first transmission 652 and a second DMRS 694 of a second transmission 662 or associated with a second transmission 662. In some implementations, the first DMRS692 and the second DMRS 694 are similar. For example, they have the same number of DMRS symbols, and these DMRS symbols are located in symbol positions or slots (referred to as symbol positions).

Additionally, each of the first message 650 and the second message 660 has or is associated with a corresponding CRS. The CRS may be associated with a particular network entity transmitting the message, or may be associated with a particular value of a higher layer index configured per CORESET (i.e., associated with a CORESET group representing the TRP). To illustrate, each TRP may have an associated CRS pattern. Alternatively, a single CRS pattern may be used for multiple TRPs (such as multiple TRPs of a single base station or serving cell). When multiple CRS patterns are used, UE115, network entity 605, network entity 607, or a combination thereof may generate a combined CRS pattern (such as a CRS pattern union comprising each resource of the multiple CRS patterns).

After transmission of the first message 650, the second message 660, or both, the UE115, the network entity 605, the network entity 607, or a combination thereof, may determine whether the one or more associated CRS patterns overlap with the associated DMRS of the first message 650 or the second message 660. Although not illustrated in fig. 6, the CRS pattern may be transmitted in

messages

650, 660 or other messages (such as through RRC messages or configurations).

To illustrate, the UE115 may determine whether any resources of the one or more associated CRS patterns overlap with any resources (such as DMRS symbols) of the first and

second DMRSs

692, 694 for the first and

second transmissions

652, 662 indicated by the

messages

650, 660. In response to determining not to overlap, the UE115 may refrain from performing the DMRS shift. For example, UE115 may refrain from determining whether one or more CRS resources and DMRS symbols overlap. As another example, the UE115 may refrain from modifying (such as shifting) the DMRS symbols, or not, even if the UE115 determines that one or more CRS resources and DMRS symbols overlap.

In response to determining the overlap, the UE115 may perform a DMRS shift. In some implementations, the above determination is only performed when first transmission 652 and second transmission 662 at least partially overlap in time, frequency, or both. In such implementations, the above determination is not performed when the first transmission 652 and the second transmission 662 do not overlap, such as when their resources, such as Resource Blocks (RBs), are orthogonal and the CRS pattern does not have an association with the first transmission (or, optionally, any transmission). Examples of overlap include partial overlap of first transmission 652 with second transmission 662 in time, frequency, or both, or complete overlap of first transmission 652 with second transmission 662 in time, frequency, or both. As an illustrative example, if the

transmissions

652, 662 are frequency division multiplexed, they may partially or fully overlap in the time domain (such as by occupying at least one common ofdm symbol in an orthogonal resource block).

The UE115 and the network entity 605 or the network entities 605 and 607 modify the

DMRSs

692, 694 to generate modified

DMRSs

696, 698.

Transmissions

652, 662 include modified DMRSs, i.e.,

DMRSs

696 and 698, respectively.

The network entity 605 or the network entities 605 and 607 may encode

transmissions

652, 662 to be transmitted, such as via the same serving cell (such as the same CC) or multiple serving cells (such as multiple CCs). For example, network entity 605 may transmit first transmission 652 via first CC 681 and may transmit second transmission 662 via second CC 682.

The UE115 receives

transmissions

652, 662 that include modified

DMRSs

696 and 698. For example, the UE115 decodes or processes the

transmissions

652, 662 based on the modified

DMRSs

696 and 698. Based on the decoding of the

messages

650, 660,

transmissions

652, 662, or both, the UE115 may send one or more acknowledgement messages (such as PUCCH) to the network entities 605, 607. It should be noted that the acknowledgement message may include or correspond to a positive or negative acknowledgement, such as an ACK/NACK. The UE115 may send an ACK or NACK based on determining whether the first transmission 652, the second transmission 662, or both, were successfully decoded. To illustrate, if the decoding is successful, an ACK is communicated; and if the decoding is unsuccessful, a NACK is communicated.

Referring to fig. 7A-7C and 8A-8C, diagrams illustrating DMRS modifications are depicted. Fig. 7A-7C are block diagrams illustrating examples of DMRS modifications for a single PDSCH. Fig. 7A-7C correspond to DMRS modifications for a single PDSCH, while fig. 8A-8C correspond to DMRS modifications for multiple PDSCHs. In fig. 7A-7C and 8A-8C, the symbols of the PDSCH are illustrated in pattern fill.

Referring to fig. 7A, a block diagram illustrating an example DMRS pattern/scheme is illustrated. Fig. 7A depicts an example of a DMRS pattern for a PDSCH (such as a portion thereof). In the example of fig. 7A, the PDSCH (such as the portion of the PDSCH) includes 10 symbols. These 10 symbols may be used for DMRS and data, such as DMRS symbols and data symbols. As illustrated in fig. 7A, the DMRS for the PDSCH includes four DMRS symbols and six data symbols. The four DMRS symbols are located at symbols 1, 5 and 8 of the PDSCH (when numbering starts from 1).

Referring to fig. 7B, a block diagram illustrating an example CRS pattern/scheme is illustrated. Fig. 7B depicts an example of CRS pattern. Similar to fig. 7A, in the example of fig. 7B, the PDSCH includes 10 symbols. All or a portion of the symbols of the PDSCH may be used for CRS (such as for CRS rate matching) and may correspond to CRS blocks. As illustrated in fig. 7B, the CRS includes or occupies four symbols. These four symbols are located at symbols 1, 4, 5 and 8 of the PDSCH (when numbering starts from 1).

Referring to fig. 7C, a block diagram illustrating an example DMRS modification is illustrated. Fig. 7C illustrates DMRS shifting by modifying the position of one or more DMRS symbols of a transmission (such as PDSCH).

In fig. 7C, a single PDSCH is illustrated. The PDSCH has a DMRS pattern or scheme as illustrated in fig. 7A. Additionally, the PDSCH has or is associated with the CRS pattern or scheme illustrated in fig. 7B. As illustrated in fig. 7C, the plurality of DMRS symbols (positions thereof) may overlap with CRS blocks of the CRS pattern illustrated in fig. 7B. Specifically, each of the DMRS symbols (1, 4, and 8) overlaps with CRS resources/symbols of the CRS pattern. Accordingly, each DMRS symbol of each PDSCH is modified based on the overlap of one or more DMRS symbols and CRS blocks/locations.

For example, the location of each DMRS symbol of the PDSCH is modified based on the modification parameter. In the example illustrated in fig. 7C, each DMRS symbol position is incremented by a first value (i.e., 1).

Fig. 8A-8C are block diagrams illustrating examples of DMRS modifications for multiple PDSCHs. Referring to fig. 8A, a block diagram illustrating an example DMRS pattern/scheme is illustrated. Fig. 8A depicts an example of DMRS patterns for PDSCH. In the example of fig. 8A, the PDSCH includes 14 symbols. The first four symbols are unused by DMRS and unused for data (i.e., not assigned to PDSCH), and may correspond to gaps or control data. The remaining 10 symbols may be used for DMRS and data. As illustrated in fig. 8A, the DMRS of the PDSCH includes 4 DMRS symbols. These four DMRS symbols are located at symbols 5, 9 and 12 of the PDSCH (when numbering starts from 1).

Referring to fig. 8B, a block diagram illustrating an example CRS pattern/scheme is illustrated. Fig. 8B depicts an example of a CRS pattern, such as one of a possible number of CRS patterns configured for a component carrier. Similar to fig. 8A, in the example of fig. 8B, the PDSCH includes 14 symbols. All or a portion of the symbols of the PDSCH may be used for CRS (such as for CRS rate matching) and may correspond to CRS blocks. As illustrated in fig. 8B, the CRS includes or occupies 6 symbols. The six symbols are located at

symbols

1, 2, 5, 8, 9 and 12 of the PDSCH (when numbering starts from 1).

Referring to fig. 8C, a block diagram illustrating an example DMRS modification is illustrated. Fig. 8C illustrates DMRS shifting by increasing the position of each DMRS symbol of an overlapping transmission (such as PDSCH).

In fig. 8C, two partially overlapping PDSCHs are illustrated. These PDSCHs (which correspond to two TRPs, two higher layer indices, or two CORESET groups) have DMRS patterns as illustrated in fig. 8A. Additionally, these PDSCHs have or are associated with the CRS pattern or scheme illustrated in fig. 8B. Alternatively, the CRS pattern may be associated with only one of the PDSCHs. As illustrated in fig. 8C, the plurality of DMRS symbols (their positions) overlap with CRS blocks of the CRS pattern illustrated in fig. 8B. Specifically, each of the DMRS symbols (5, 9, and 12) of each PDSCH overlaps with CRS resources/symbols of the CRS pattern. Accordingly, each DMRS symbol of each PDSCH is modified based on the overlap of one or more DMRS symbols and CRS blocks/locations. This may be done independently of the CRS pattern and association of the two PDSCHs (i.e., on both PDSCHs).

For example, the location of each DMRS symbol for each PDSCH is modified based on the modification parameter. In the example illustrated in fig. 8C, each DMRS symbol position is incremented by a first value (i.e., 1). Although incrementing is shown, in some other implementations, DMRS symbol positions may be decremented, divided, multiplied, adjusted using a table or formula, or a combination thereof. Additionally, although a value of 1 is applied to the incrementing of DMRS symbol positions, in some other implementations, other values may be used, such as 2, 3, 4, and so on.

Although each DMRS symbol overlaps with CRS resources and is moved, in some other implementations, each DMRS symbol is moved based on only a single DMRS symbol and CRS resource overlap in one PDSCH. Additionally or alternatively, although the PDSCHs partially overlap in both time and frequency, in some other implementations, the PDSCHs may completely overlap in time, frequency, or both, or may partially overlap in time or frequency.

When there are one or more CRS patterns (such as lte-CRS-tomacharound or its extensions to multiple CRS patterns) around which to rate match to decide whether any DMRS symbols of two PDSCHs (which correspond to two TRPs, two higher layer indices, or two CORESET groups) are shifted, the one or more CRS patterns may be considered for the two PDSCHs regardless of their association with the CRS patterns (i.e., with the TRPs, higher layer indices, or CORESET groups).

For example, when only one CRS pattern or CRS pattern set (such as lte-CRS-ToMatchAround) is configured and associated with a first TRP (such as a first higher layer index value, i.e., a first CORESET group) and two PDSCHs partially/completely overlap, DMRSs of both PDSCHs are shifted even if the CRS pattern(s) is associated with only one PDSCH (such as a second PDSCH).

In some implementations, for shifting the DMRS pattern (i.e., where the DMRS is in the same symbol as the CRS), the two PDSCHs follow the same behavior regardless of the association of the CRS pattern. Additionally or alternatively, for rate matching, only the first PDSCH may be rate matched around CRS-patterned resources, while the second PDSCH may not be rate matched around CRS-patterned resources (which are configured for CORESET and component carriers). That is, even though PDSCH rate matching may account for CRS pattern (or CRS pattern list) to TRP (or to CORESET groups) associations, DMRS shifting is performed independently of PDSCH to TRP (or to CORESET groups) associations or CRS pattern (or CRS pattern list) to TRP (or to CORESET groups).

The CRS pattern or list may be generally configured for multiple TRP UEs, in the serving cell, and for higher layer index values (i.e., CORESET group). Accordingly, the one or more CRS patterns are intended as a design option for a component carrier and a TRP (CORESET group) within the component carrier, and thus the one or more CRS patterns are configured for a component carrier and a TRP.

Although the PDSCH have the same DMRS pattern in the examples provided herein, in some other implementations, the PDSCH may have different DMRS patterns from one another. In such implementations, the DMRS pattern for one or both PDSCHs may be adjusted based on the collision of any of the DMRS patterns.

Fig. 9 is a block diagram illustrating example blocks performed by a UE. Example blocks will also be described with respect to UE115 as illustrated in fig. 11. Fig. 11 is a block diagram conceptually illustrating an example design of a UE. Fig. 11 illustrates a UE115 configured according to an aspect of the present disclosure. The UE115 includes the structure, hardware, and components as illustrated for the UE115 of fig. 2 or 6. For example, the UE115 includes a controller/processor 280 that operates to execute logic or computer instructions stored in memory 282, as well as to control various components of the UE115 that provide the features and functionality of the UE 115. UE115 transmits and receives signals via wireless radios 1101a-r and antennas 252a-r under the control of controller/processor 280. The wireless radios 1101a-r include various components and hardware, as illustrated in fig. 2 with respect to the UE115, including demodulators/modulators 254a-r, a MIMO detector 256, a receive processor 258, a transmit processor 264, and a TX MIMO processor 266.

As shown, memory 282 may include DMRS modification logic 1102, CRS rate matching logic 1103, CORESET group logic 1104, DMRS data 1105, modified DMRS data 1106, DMRS modification data 1107, CRS data 1108, and CORESET group data 1109. DMRS data 1105, modified DMRS data 1106, DMRS modification data 1107, CRS data 1108, and CORESET group data 1109 may include or correspond to DMRS data 606, CRS data 608, CORESET data 642, and modification parameters 644. The DMRS modification logic 1102 may include or correspond to a DMRS modifier 615. The CRS rate matching logic 1103 may include or correspond to a CRS rate matcher 616. The CORESET group logic 1104 may include or correspond to a DMRS modifier 615, a CRS rate matcher 616, or both. In some aspects, the logic 1102-1104 may include or correspond to the processor(s) 280. The UE115 may receive and transmit signals from and to one or more base stations, such as the base station 105 or one or more network entities 605, 607. When communicating with a single base station or serving cell, UE115 may receive/transmit signals from/to multiple TRPs of the single base station or serving cell.

Referring to fig. 9, at block 900, a UE receives a configuration message including at least one CRS pattern list for a component carrier. A list of the at least one list is associated with a control resource set (CORESET) group.

At block 901, a UE receives a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for a component carrier.

At block 902, the UE receives a second message scheduling a second transmission associated with a second DMRS and for the component carrier. In some implementations, the first and second messages are DCI or RRC messages. Additionally or alternatively, the first and second transmissions are PDSCH transmissions. In some implementations, the first and second DMRSs may be aligned (such as having the same symbol position).

At block 903, the UE may optionally determine whether one or more CRS patterns overlap with the first DMRS or the second DMRS. The determination may be based on whether the one or more CRS patterns are configured for the UE (e.g., as described in Technical Specification (TS)38.211v16.1.0 section 7.4.1.1.2). In some implementations, a single CRS pattern associated with multiple TRPs is used. In some other implementations, each TRP has an associated CRS pattern and it is checked whether each CRS pattern overlaps with each DMRS.

At block 904, the UE modifies at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS based on the list being configured for the component carrier.

In some implementations, the method may further include determining whether the first transmission at least partially overlaps with the second transmission (such as the component carriers being the same and the CORESET group being different). For example, it is checked whether a first resource of a first transmission overlaps a second resource of a second transmission in the time domain, the frequency domain, or both. In some such implementations, one or more of the previously described blocks are performed in response to or based on this determination. To illustrate, based on the UE determining that the first transmission does not overlap the second transmission (such as in the case of orthogonal resource blocks), DMRS modification or overlap determination may not be performed.

In some implementations, the method may further include receiving the first and second transmissions with the modified DMRS symbols. To illustrate, the UE115 may receive first and second transmissions having DMRS symbol positions shifted from DMRS patterns indicated by or associated with corresponding first and second messages.

Fig. 10 is a block diagram illustrating example blocks performed by a network entity. The network entity may comprise or correspond to a base station configured according to an aspect of the present disclosure or a TRP thereof. Example blocks will also be described with respect to a gNB 105 (or eNB) as illustrated in fig. 12. Fig. 12 is a block diagram conceptually illustrating an example design of a network entity. Fig. 12 illustrates a gNB 105 configured according to one aspect of the present disclosure. The gNB 105 includes the structure, hardware, and components as illustrated with respect to the gNB 105 of fig. 2. For example, gNB 105 includes a controller/processor 240 that operates to execute logic or computer instructions stored in memory 242 and to control the various components of gNB 105 that provide the features and functionality of gNB 105. Under the control of controller/processor 240, gNB 105 transmits and receives signals via wireless radios 1201a-t and antennas 234 a-t. The wireless radios 1201a-t include various components and hardware, as illustrated in fig. 2 with respect to the gNB 105, including modulators/demodulators 232a-t, a MIMO detector 236, a receive processor 238, a transmit processor 220, and a TX MIMO processor 230. Data 1202-1209 in memory 242 may comprise or correspond to corresponding data 1102-1109 in memory 282, respectively.

Referring to fig. 10, at block 1000, a network entity transmits a configuration message including at least one CRS pattern list for a component carrier. The list of the at least one list is associated with a control resource set (CORESET) group.

At block 1001, a network entity transmits a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier.

At block 1002, the network entity transmits a second message scheduling a second transmission associated with a second DMRS and for the component carrier. In some implementations, the first and second messages are DCI or RRC messages. Additionally or alternatively, the first and second transmissions are PDSCH transmissions. In some implementations, the first and second DMRS may be the same (such as having the same symbol positions).

At block 1003, the network entity may optionally determine whether one or more CRS patterns overlap with the first DMRS or the second DMRS. The determination may be based on whether the one or more CRS patterns are configured for the UE (e.g., as described in 5G NR Technical Specification (TS)38.211v16.1.0 section 7.4.1.1.2). In some implementations, a single CRS pattern associated with multiple TRPs is used. In some other implementations, each TRP has an associated CRS pattern and it is checked whether each CRS pattern overlaps with each DMRS.

At block 1004, the network entity modifies at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that the list is configured for the component carrier.

In some implementations, the method may further include determining whether the first transmission at least partially overlaps with the second transmission (such as the component carriers being the same and the CORESET group being different). For example, it is checked whether a first resource of a first transmission overlaps a second resource of a second transmission in the time domain, the frequency domain, or both. In some such implementations, one or more of the previously described blocks are performed in response to or based on this determination. To illustrate, DMRS modification or overlap determination may not be performed based on a network entity determining that a first transmission does not overlap a second transmission (such as in the case of orthogonal resource blocks).

In some implementations, the method may further include transmitting the first transmission, the second transmission, or both. When transmitted, the first and second transmissions may have modified DMRS symbols. To illustrate, a network entity may transmit first and second transmissions having DMRS symbol positions shifted as compared to DMRS patterns indicated by or associated with corresponding first and second messages.

It should be noted that one or more blocks (or operations) described with reference to fig. 9 and 10 may be combined with one or more blocks (or operations) in another drawing. For example, one or more blocks of fig. 9 and 10 may be combined with one or more blocks (or operations) of another of fig. 2, 3, 4, 6, or 10. Additionally or alternatively, one or more of the operations described above with reference to fig. 1-6 may be combined with one or more of the operations described with reference to fig. 9 and 10.

Those of skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The components, functional blocks, and modules described herein (such as the components of fig. 6, the functional blocks of fig. 9 and 10, and the modules in fig. 2) may include processors, electronics devices, hardware devices, electronic components, logic circuits, memories, software codes, firmware codes, etc., or any combination thereof. Additionally, features discussed herein as relating to components, functional blocks, and modules described herein (such as the components of fig. 6, the functional blocks of fig. 9 and 10, and the modules in fig. 2) may be implemented via dedicated processor circuitry, via executable instructions, or a combination thereof.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure. Skilled artisans will also readily recognize that the order or combination of components, methods, or interactions described herein is merely an example and that the components, methods, or interactions of the various aspects of the disclosure may be combined or performed in a manner different from that illustrated and described herein.

The various illustrative logics, logical blocks, modules, circuits, and algorithm processes described in connection with the implementations disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. This interchangeability of hardware and software has been described generally, in terms of its functionality, and is illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

The hardware and data processing apparatus used to implement the various illustrative logics, logical blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose single-or multi-chip processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine. In some implementations, a processor may be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. In some implementations, certain processes and methods may be performed by circuitry that is dedicated to a given function.

In one or more aspects, the functions described may be implemented in hardware, digital electronic circuitry, computer software, firmware, including the structures disclosed in this specification and their structural equivalents, or any combination thereof. Implementations of the subject matter described in this specification can also be implemented as one or more computer programs, i.e., one or more modules of computer program instructions, encoded on a computer storage medium for execution by, or to control the operation of, data processing apparatus.

If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. The processes of the methods or algorithms disclosed herein may be implemented in processor-executable software modules, which may reside on computer-readable media. Computer-readable media includes both computer storage media and communication media, including any medium that can be implemented to transfer a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. Disk (disk) and disc (disc), as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disks) usually reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media. Additionally, the operations of a method or algorithm may reside as one or any combination or set of codes and instructions on a machine readable medium and computer readable medium, which may be incorporated into a computer program product.

Various modifications to the implementations described in this disclosure may be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other implementations without departing from the spirit or scope of the disclosure. Thus, the claims are not intended to be limited to the implementations shown herein but are to be accorded the widest scope consistent with the present disclosure, the principles and novel features disclosed herein.

In addition, those of ordinary skill in the art will readily appreciate that the terms "upper" and "lower" are sometimes used for ease of describing the drawings and indicate relative positions corresponding to the orientation of the drawings on a properly oriented page and may not reflect the true orientation of any device as implemented.

Certain features that are described in this specification in the context of separate implementations can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination. Furthermore, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination, or variation of a subcombination.

Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Further, the figures may schematically depict one or more example processes in the form of a flow diagram. However, other operations not depicted may be incorporated into the schematically illustrated example process. For example, one or more additional operations may be performed before, after, concurrently with, or between any of the illustrated operations. In some environments, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the implementations described above should not be understood as requiring such separation in all implementations, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products. Additionally, other implementations are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results.

Claims

1. A method of wireless communication, comprising:

receiving, by a User Equipment (UE), a first message scheduling a first transmission, the first transmission associated with a first demodulation reference Signal (DMRS);

receiving, by the UE, a second message scheduling a second transmission, the second transmission associated with a second DMRS;

determining, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS; and

modifying, by the UE, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with the at least one DMRS symbol of the first DMRS or the second DMRS.

2. The method of claim 1, wherein modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS comprises:

modifying the at least one DMRS symbol of the first DMRS and the at least one DMRS symbol of the second DMRS.

3. The method of claim 1, further comprising: receiving, by the UE, the first transmission with the modified DMRS symbol.

4. The method of claim 3, further comprising: receiving, by the UE, the second transmission having the modified DMRS symbol.

5. The method of claim 1, wherein the first message corresponds to a first Transmission Reception Point (TRP), and wherein the second message corresponds to a second TRP.

6. The method of claim 1, wherein the UE is operating in a multi-Downlink Control Information (DCI) multi-Transmission Reception Point (TRP) mode.

7. The method of claim 1, wherein the first TRP is associated with a first CRS pattern, and wherein the second TRP is associated with a second CRS pattern.

8. The method of claim 1, wherein the first message corresponds to Downlink Control Information (DCI).

9. The method of claim 1, wherein the first message comprises a periodic grant and corresponds to a Downlink Control Information (DCI) or Radio Resource Control (RRC) message configured to schedule a plurality of transmissions including the first transmission.

10. The method of claim 1, wherein the first message is received on a Physical Downlink Control Channel (PDCCH).

11. The method of claim 1, wherein the first transmission is received on a Physical Downlink Shared Channel (PDSCH).

12. The method of claim 1, wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises:

adjusting a position of the at least one DMRS symbol of the first DMRS.

13. The method of claim 1, wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises:

incrementing a position value of each DMRS symbol of the first DMRS of the first transmission by 1; and

incrementing a position value of each DMRS symbol of the second DMRS of the second transmission by 1.

14. The method of claim 1, further comprising: determining whether the first transmission at least partially overlaps the second transmission.

15. The method of claim 1, wherein determining whether the one or more CRS patterns overlap with the first DMRS or the second DMRS is performed in response to determining that a first resource of the first transmission at least partially overlaps with a second resource of the second transmission.

16. The method of claim 1, wherein first resources of the first transmission are orthogonal to second resources of the second transmission in a time domain, a frequency domain, or both.

17. The method of claim 1, wherein first resources of the first transmission do not overlap with second resources of the second transmission in a time domain, a frequency domain, or both.

18. The method of claim 1, in which the UE performs DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) mode independently of CRS and TRP associations.

19. The method of claim 1, wherein the UE performs DMRS shifting across a plurality of Transmission Receiving Points (TRPs), and wherein the UE performs rate matching per TRP.

20. The method of claim 1, wherein the first message corresponds to a first Transmission Reception Point (TRP) or a first group of control resource sets (CORESET) and the second message corresponds to a second TRP or a second group of CORESET, and wherein the first and second CORESET groups are indicated by higher level signaling.

21. The method of claim 1, further comprising: transmitting, by the UE, a capability message indicating that the UE is configured for DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) mode prior to receiving the first message.

22. The method of claim 1, further comprising: prior to receiving the first message, receiving, by the UE, a message indicating that the UE is to perform a DMRS shift for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) mode.

23. A method of wireless communication, comprising:

transmitting, by a network entity, a first message scheduling a first transmission, the first transmission associated with a first demodulation reference signal (DMRS);

transmitting, by the network entity, a second message scheduling a second transmission, the second transmission associated with a second DMRS;

determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS; and

modifying, by the network entity, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with the at least one DMRS symbol of the first DMRS or the second DMRS.

24. The method of claim 23, wherein modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS comprises:

25. The method of claim 23, further comprising: transmitting, by the network entity, the first transmission with the modified DMRS symbol.

26. The method of claim 25, further comprising: transmitting, by the network entity, the second transmission with the modified DMRS symbol.

27. The method of claim 23, wherein the first message corresponds to a first Transmission Reception Point (TRP), and wherein the second message corresponds to a second TRP.

28. The method of claim 23, wherein the network entity is operating in a multi-Downlink Control Information (DCI) multi-Transmission Reception Point (TRP) mode.

29. The method of claim 23, wherein the first TRP is associated with a first CRS pattern and wherein the second TRP is associated with a second CRS pattern.

30. The method of claim 23, wherein the first message corresponds to Downlink Control Information (DCI).

31. The method of claim 23, wherein the first message comprises a periodic grant and corresponds to a Downlink Control Information (DCI) or Radio Resource Control (RRC) message configured to schedule a plurality of transmissions including the first transmission.

32. The method of claim 23, wherein the first message is received on a Physical Downlink Control Channel (PDCCH).

33. The method of claim 23, wherein the first transmission is received on a Physical Downlink Shared Channel (PDSCH).

34. The method of claim 23, wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises:

adjusting a position of the at least one DMRS symbol of the first DMRS.

35. The method of claim 23, wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises:

36. The method of claim 23, wherein first resources of the first transmission partially overlap with second resources of the second transmission in a time domain, a frequency domain, or both.

37. The method of claim 23, wherein first resources of the first transmission completely overlap with second resources of the second transmission in a time domain, a frequency domain, or both.

38. The method of claim 23, wherein first resources of the first transmission are orthogonal to second resources of the second transmission in a time domain, a frequency domain, or both.

39. The method of claim 23, wherein first resources of the first transmission do not overlap with second resources of the second transmission in a time domain, a frequency domain, or both.

40. The method of claim 23, wherein the network entity performs DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) pattern independent of CRS and TRP associations.

41. The method of claim 23, wherein the network entity performs DMRS shifting across a plurality of Transmission Receiving Points (TRPs), and wherein the network entity performs rate matching per TRP.

42. The method of claim 23, wherein the first message corresponds to a first Transmission Reception Point (TRP) or a first group of control resource sets (CORESET) and the second message corresponds to a second TRP or a second group of CORESET, and wherein the first and second CORESET groups are indicated by higher level signaling.

43. The method of claim 23, further comprising: prior to transmitting the first message, receiving, by the network entity, a capability message indicating that the UE is configured for DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmit Reception Point (TRP) mode.

44. The method of claim 23, further comprising: transmitting, by the network entity, a message indicating that a User Equipment (UE) is to perform DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) mode prior to transmitting the first message.

45. An apparatus configured for wireless communication, comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to:

46. The device of claim 45, wherein the device is configured to perform the method of any of claims 1-22.

47. An apparatus configured for wireless communication, comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to:

48. The device of claim 47, wherein the device is configured to perform the method of any of claims 23-44.

49. An apparatus configured for wireless communication, comprising:

means for receiving, by a User Equipment (UE), a first message scheduling a first transmission, the first transmission associated with a first demodulation reference signal (DMRS);

means for receiving, by the UE, a second message scheduling a second transmission, the second transmission associated with a second DMRS;

means for determining, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS; and

means for modifying, by the UE, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with the at least one DMRS symbol of the first DMRS or the second DMRS.

50. The device of claim 49, wherein the device is configured to perform the method of any one of claims 1-22.

51. An apparatus configured for wireless communication, comprising:

means for transmitting, by a network entity, a first message scheduling a first transmission, the first transmission associated with a first demodulation reference signal (DMRS);

means for transmitting, by the network entity, a second message scheduling a second transmission, the second transmission associated with a second DMRS;

means for determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS or the second DMRS; and

means for modifying, by the network entity, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with the at least one DMRS symbol of the first DMRS or the second DMRS.

52. The device of claim 51, wherein the device is configured to perform the method of any of claims 23-44.

53. A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations comprising:

54. The non-transitory computer readable medium of claim 53, wherein the processor is configured to perform the method of any one of claims 1-22.

55. A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations comprising:

56. The non-transitory computer readable medium of claim 55, wherein the processor is configured to perform the method of any one of claims 23-44.

57. A method of wireless communication, comprising:

determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS;

modifying, by the network entity, at least one DMRS symbol of the first DMRS in response to determining that at least one of the one or more CRS patterns overlaps with the at least one DMRS symbol of the first DMRS; and

transmitting, by the network entity, the first transmission with the modified DMRS symbol.

58. The method of claim 57, further comprising: determining, by the network entity, whether the one or more CRS patterns overlap with a second DMRS associated with a second transmission by another network entity, wherein modifying at least one DMRS symbol of the first DMRS is further in response to determining whether the at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of the second DMRS.

59. The method of claim 58, further comprising: modifying, by the network entity, the at least one DMRS symbol of the second DMRS in response to determining that at least one of the one or more CRS patterns overlaps the at least one DMRS symbol of the first DMRS or the at least one DMRS symbol of the second DMRS.

60. A method of wireless communication, comprising:

receiving, by a User Equipment (UE), a configuration message comprising at least one cell-specific reference signal (CRS) pattern list for a component carrier, wherein a list of the at least one list is associated with a control resource set (CORESET) group;

receiving, by the UE, a first message scheduling a first transmission associated with a first demodulation reference Signal (DMRS) and for the component carrier;

receiving, by the UE, a second message scheduling a second transmission associated with a second DMRS and for the component carrier; and

modifying, by the UE, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS based on the list being configured for the component carrier.

61. The method of claim 60, wherein the first transmission is associated with the CORESET group, and wherein the second transmission is associated with a second CORESET group.

62. The method of claim 60, wherein the determination that the at least one list is configured for DMRS shifts indicates that one or more CRS patterns overlap with the first DMRS or the second DMRS.

63. The method of claim 60, further comprising: determining, by the UE, whether one or more CRS patterns of the at least one list overlap with the first DMRS or the second DMRS, wherein modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS is further in response to determining that at least one CRS pattern of the one or more CRS patterns overlaps with at least one DMRS symbol of the first DMRS or the second DMRS.

64. The method of claim 60, wherein the at least one CRS-pattern list is configured for the component carriers to enable DMRS shifting, rate matching, or both.

65. The method of claim 60, wherein modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS comprises:

66. The method of claim 60, further comprising: receiving, by the UE, the first transmission with the modified DMRS symbol.

67. The method of claim 66, further comprising: receiving, by the UE, the first transmission with the modified DMRS symbol.

68. An apparatus for wireless communication, comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to:

receiving a configuration message comprising at least one cell-specific reference signal (CRS) pattern list for component carriers, wherein a list of the at least one list is associated with a control resource set (CORESET) group;

receiving a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier;

receiving a second message scheduling a second transmission associated with a second DMRS and for the component carrier; and

modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS based on the list being configured for the component carrier.

69. The apparatus of claim 68, wherein the apparatus is operating in a multiple Downlink Control Information (DCI) multiple Transmit Receive Point (TRP) mode.

70. The apparatus of claim 68, wherein a second CORESET group is associated with a second CRS pattern list of the at least one CRS pattern list.

71. The apparatus of claim 68, wherein the first message is received on a Physical Downlink Control Channel (PDCCH), and wherein the first transmission is received on a Physical Downlink Shared Channel (PDSCH).

72. The device of claim 68, wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises:

adjusting a position of the at least one DMRS symbol of the first DMRS.

73. The device of claim 68, wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises:

74. The apparatus of claim 68, wherein the apparatus performs DMRS shifting for a multiple Downlink Control Information (DCI) multiple Transmission Reception Point (TRP) mode independently of CRS and TRP associations.

75. The apparatus of claim 68, wherein the apparatus performs DMRS shifting across a plurality of Transmission Reception Points (TRPs), and wherein the apparatus performs rate matching per TRP.

76. A method of wireless communication, comprising:

transmitting, by a network entity, a configuration message comprising at least one cell-specific reference signal (CRS) pattern list for component carriers, wherein a list of the at least one list is associated with a control resource set (CORESET) group;

transmitting, by the network entity, a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier;

transmitting, by the network entity, a second message scheduling a second transmission associated with a second DMRS and for the component carrier; and

modifying, by the network entity, the at least one DMRS symbol of the first DMRS or the at least one DMRS symbol of the second DMRS in response to determining that the list is configured for the component carrier.

77. The method of claim 76, wherein the first transmission is associated with the CORESET group, and wherein the second transmission is associated with a second CORESET group.

78. The method of claim 76, wherein modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS comprises:

79. The method of claim 76, further comprising:

transmitting, by the network entity, the first transmission with the modified DMRS symbol;

transmitting, by the network entity, the second transmission with the modified DMRS symbol; or

And both.

80. The method of claim 76, wherein a second CORESET group is associated with a second CRS pattern list of the at least one CRS pattern list.

81. The method of claim 76, wherein the first message corresponds to Downlink Control Information (DCI).

82. The method of claim 76, wherein the first message comprises a periodic grant and corresponds to a Downlink Control Information (DCI) or Radio Resource Control (RRC) message configured to schedule a plurality of transmissions including the first transmission.

83. An apparatus for wireless communication, comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to:

transmitting a configuration message comprising at least one cell-specific reference signal (CRS) pattern list for component carriers, wherein a list of the at least one list is associated with a control resource set (CORESET) group;

transmitting a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier;

transmitting a second message scheduling a second transmission associated with a second DMRS and for the component carrier; and

modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that the list is configured for the component carrier.

84. The device of claim 83, wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises:

adjusting a position of the at least one DMRS symbol of the first DMRS.

85. The device of claim 83, wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises:

86. The device of claim 83, wherein first resources of the first transmission at least partially overlap with second resources of the second transmission in a time domain, a frequency domain, or both.

87. The device of claim 83, wherein first resources of the first transmission are orthogonal in time domain, frequency domain, or both to second resources of the second transmission.

88. The device of claim 83, wherein first resources of the first transmission do not overlap with second resources of the second transmission in a time domain, a frequency domain, or both.

89. The apparatus of claim 83, wherein the first message corresponds to the CORESET group, wherein the second message corresponds to a second CORESET group, and wherein each CORESET group is indicated by higher level signaling.